Energizing circuit for solenoid valve

Details Energizing circuit for solenoid valve Energizing circuit for solenoid valve

1978-07-12

1981-01-20

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 361111, 361159, H02H 904

Patent

active

042466210

ABSTRACT:
An engergizing circuit for a solenoid valve has a power source connected to a solenoid coil of the solenoid valve through on-off contacts. The energizing circuit includes a capacitor and a solid-state surge absorber which are respectively connected in parallel with the solenoid coil, and the surge absorber is made from a sintered material containing a metal oxide as a principal component and having a non-linear electric resistance characteristic with respect to the applied voltage. By virtue of the solenoid valve energizing circuit constructed as described, when the on-off contacts are separated, the occurrence of an arc between the contacts thus preventing wear of the contacts, while when the solenoid coil is deenergized, the delay time in the return movement of the valve spool is decreased, and moreover the surge voltage produced across the ends of the solenoid coil upon its deenergization is controlled to a predetermined low voltage.

REFERENCES:
patent: 1966077 (1934-07-01), Nyman
patent: 3705333 (1972-12-01), Galetto et al.
patent: 3928245 (1975-12-01), Fishman et al.
"Engineer's Relay Handbook"-Hayden Book Company, Inc., 1966, pp. 95, 96.

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